* '''PCT_DOCUMENT_NUMBER'''
** only for XML 4.30 utility, 4.4, 4.5 (Note: no pct_document_number for 2.5utility, 4.0, 4.1, or 4.2)3 reissue
*** <code>//us-bibliographic-data-grant/pct-or-regional-filing-data/document-id/doc-number</code>
** APS